Whishhhh noise when cold.. - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 11-13-2019, 04:50 PM Thread Starter
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Whishhhh noise when cold..

I noticed this first about a week ago.
When cold, and night time / eve temperatures are in the 20s, the motor makes a jet like whishhhh type noise at LOW throttle. I can punch through what ever this is by heavy throttle and loading the engine.

But you return to low throttle and again get the whishhh thing.

When punching through, you also notice a power come back. As if its weaker during the whishh noise.

When the engine is thoroughly warm, this goes away.

Also, you know how if you let a vehicle wam up at idle, sometimes the idle bumps up 100-150 rpm? Then you tap the accelerator and it falls back to a normal idle?

Well, now it seems to make the noise during the high idle, sounds normal during low idle.

This sound seems to be comming from the exhaust pipe.
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post #2 of 5 Old 11-13-2019, 05:39 PM
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That is the Exhaust Back Pressure Valve -- basically a flapper to restrict the exhaust -- it helps the engine warm up faster

The EBPV is supposed to open up if you accelerate -- and when warm it should be open
possible the temp sensor is bad or the wiring to the actuator is worn thru
it is located in the turbo mounting base -- take a look at the harness and linkage to the actuator

The idle thing is also part of the warm up

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post #3 of 5 Old 11-13-2019, 06:07 PM Thread Starter
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I just watched a video of a guy the rigged his to an on/off switch in the cab. He flipped it on and off... his 7.3l was making the same noise that i am hearing.

(Didnt i take that sensor off when i did my HPOP?)
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post #4 of 5 Old 11-13-2019, 07:03 PM Thread Starter
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So is this an emergency level thing?
Or is it something that can wait?

I am going to be moving my RV from PA to TN shortly.
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post #5 of 5 Old 11-14-2019, 07:53 AM
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Quote:
Originally Posted by groundhogy View Post
So is this an emergency level thing?
Or is it something that can wait?

I am going to be moving my RV from PA to TN shortly.

Its an oem pieice designed to help "accelerate warm up" most just delete it, rig It, or some kits can turn it into a diy exhaust brake. Many delete it because too be honest it doesn't do squat and the plunger arm can leak oil etc. One word of advice. if you delete it get a garret brand non ebpv turbo pedestal. Don't mess with aftermarket ones trying to save $20. All can be bought on riffraff diesel, cnc fab, and most other sites.

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